SYNOPSIS

DESCRIPTION

The i386_get_ioperm() system call will return the permission for the
process’ I/O port space in the *enable argument. The port range starts
at start and the number of contiguous entries will be returned in
*length.
The i386_set_ioperm() system call will set access to a range of I/O ports
described by the start and length arguments to the state specified by the
enable argument.

RETURNVALUES

Upon successful completion, the value 0 is returned; otherwise the
value -1 is returned and the global variable errno is set to indicate the
error.

ERRORS

The i386_get_ioperm() and i386_set_ioperm() system calls will fail if:
[EINVAL] An invalid range was specified by the start or length
arguments.
[EPERM] The caller of i386_set_ioperm was not the superuser.